Canadian Power Conversion CPC-20 User manual
Owner’s Manual
Product: DC-DC Step Down Converter
Model: CPC-20
Thank you for purchasing a Canadian Power Conversion product. Please
read this manual before operating this converter.
INSTRUCTION MANUAL
2 VDC TO 12VDC CONVERTER - MODEL NO. CPC-20
CPC-20 is a 2 VDC (nominal) to 12 VDC (nominal) dc-dc converter based on a
high performance fixed frequency power switching regulator. It is designed to
deliver a maximum current of 20 A at a dc voltage of 13.8 VDC.
Features:
High efficiency switching regulator
Small size and light weight
Cycle by cycle current limiting
Over voltage , short circuit and reverse polarity protections
INSTALLATION AND OPERATION:
General installation requirements
- The CPC-20 needs to be installed in a dry, cool, protected and well ventilated
area
- The unit may be installed on the top of or the bottom of a horizontal surface. It
can also be installed horizontally on a vertical surface
Input and output connections
The CPC-20 has a terminal block with male flat tabs (6.3 mm) for quick
connection. One is for positive 2 VDC input (marked +2 V), two are common
negative for input and output (marked 0 V) and one is for positive 12 VDC output
(marked +13.8 V).
CAUTION ! Please ensure that the polarity of the input connection is not
reversed. Always connect the positive of the 2 V battery to the positive terminal
marked +2 V and the negative terminal to any one of the two common
negative terminals marked 0 V. If there is a reverse polarity connection, the fuse
inside unit will blow.
Sizing of input and output conductors.
Conductors have resistance that opposes the current flow and produces a
voltage drop and heating. The resistance is directly proportional to the length of
the conductor and is inversely proportional to the thickness. Consequently, a
longer and thinner conductor will have higher resistance and will produce a
higher voltage drop and more heating. The size of a conductor for a particular
application will depend upon the maximum current it is required to carry and for
what distance. The size of a conductor is designated by AWG (American Wire
Gauge) number. The smaller the AWG number, the thicker the conductor. The
conductors should be sized for a maximum voltage drop of 2%. The cables
should be multi-stranded insulated copper cable rated for at least 90 º C and
preferably oil resistant. To purchase cables, please visit a welding or marine
supply store.
Cables for 24 VDC input and 12 VDC output connections.
The cables on the 2 VDC input side must be able to carry a max. current of
approx 18 A (for extreme conditions when delivering 21 A on the output at
current limit at lowest 2 V input battery voltage of 20 V). To limit voltage drop to
2%, use # 10 AWG for distance up to 6 ft. and # 8 AWG for up to 10 ft. The cables
on the 12 VDC output side must be able to carry the full 21 A current under
current limit conditions. To limit the drop in voltage to 2%, use # 10 AWG multi
stranded cables to connect to the load for a distance of up to 6 ft. and # 8 AWG
for a distance of up to 10 ft. Use female quick connect terminals (tab size 6.3
mm) on the ends of the cables to enable connection to the male tabs of the
terminal block.
E ternal fuses on the input and output sides.
The input and output connections should be made through 32 V, 20A fast blow
fuses (For example “Bussmann” Type ATC-20 or ATM-20 automotive type fuses).
The fuses should be connected in series with the positive input and output
cables. The fuse on the 2 V input side should be as close to the battery positive
terminal as possible. This will prevent the possibility of overheating & melting of
the input side cables in case of short circuit on the input side cabling (A battery
can provide very large currents during short circuit condition)
WARNING: The warranty will be voided if the above external fuses are not used
Battery Charging
The CPC-20 can also be used as a 13.8 VDC battery charger. It can charge a 12V
starter or ancillary battery from a 2 V system.
SPECIFICATIONS
Input to output isolation Not isolated
Input voltage 20 to 35 VDC
Output voltage 13.8 VDC ± 0.1 V
Output voltage regulation < 3%
Input current at no load Approx. 25 mA
Output current
Continuous 20 A
Current limit * 21A
Note: In current limit condition, the output voltage will drop if the current drawn increases beyond the current
limit value of 21 A
Output ripple and noise less than 50 mV RMS
Efficiency Approx. 92%
Operating ambient temperature -20 to +30oC (derate linearly to 0 at 70º C)
Humidity Max. 95%, non condensing
Protections:
- Overload By current limiting
- Over heating Drop in output voltage
- Reverse polarity Fuse protection, 20 A
- Over voltage Varistor (also protects against load dump)
Input side fuse 20 A (inside the unit)
Safety and EMC Standards:
- Emission EN50081-1
- Immunity EN50082-1
- Automotive directive 95/ 5/EC
Input / output connections Terminal Block – (6.3 mm male flat tab,
quick connect)
Weight 0. 8 lbs / .21 Kg
Dimensions (H x W x D) 1.9” x 3.5” x 5.0”( 9 x 88 x 126mm)
Warranty 5 years
NOTE: Specifications are subject to change without notice
CAUTION! : THERE IS NO ISOLATION BETWEEN THE INPUT AND THE OUTPUT. INPUT
AND OUTPUT HAVE A COMMON NEGATIVE
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